What is gemini-files-api?

A managed connection to Google Gemini for sending local files such as audio, video, images, and PDFs along with prompts. It can return structured JSON responses and supports configurable model settings.

Use it to analyze local files, make multimodal Gemini requests, run text-only checks, and receive machine-readable results from scripts.

It avoids building separate file-upload and authentication handling for each Gemini request. It also provides a documented way to keep API keys outside the skill directory.

gemini-files-api — Skill by fiveonecode

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add skills/fiveonecode/agent-skills/gemini-files-api

Any agent

npx skills add fiveonecode/agent-skills --skill gemini-files-api

Clone the repo

git clone --depth 1 https://github.com/fiveonecode/agent-skills

Made for: Claude Code, Codex.

Per session 38 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 560 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5	$0.00038	$0.00560
Opus 5	$0.00019	$0.00280
Sonnet 5	$0.00008	$0.00112
Haiku 4.5	$0.00004	$0.00056

Measured 2d ago against content hash 4d966d3fe0c1, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

gemini-files-api scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

The scan reads SKILL.md. This mod also ships 3 executable files (scripts/bootstrap.sh, scripts/gemini-mm.mjs, scripts/test_gemini_mm.mjs), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

gemini-files-api/SKILL.md · 74 lines

How it starts

The opening of the file, as written. The whole thing — 74 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Gemini Files API

Purpose

Provide one managed wrapper for Gemini requests that need local audio, video, images, PDFs, or other supported files. This repository owns the wrapper source; installed Codex, OpenCode, Claude Code, and repo-local copies are consumer views.

Setup

Install dependencies once after the skill is installed or updated:

scripts/bootstrap.sh

The wrapper requires Node.js 20 or newer. Authentication is resolved in this order:

GEMINI_API_KEY;
GOOGLE_API_KEY;
the macOS Keychain service named by GEMINI_KEYCHAIN_SERVICE, defaulting to gemini_api_key.

Do not store API keys in this skill directory.

Canonical Commands

Run a text-only smoke request:

node scripts/gemini-mm.mjs --prompt "Reply with exactly: OK"

Requests default to the stable gemini-3.5-flash model. Use --model for one request or GEMINI_MODEL for a local default; dependent skills may select a separate reviewed model for their own workflow.

Analyze a local file and return the response envelope used by dependent skills:

node scripts/gemini-mm.mjs \
  --file path/to/input.m4a \
  --prompt "Transcribe the spoken audio." \
  --json

Use node scripts/gemini-mm.mjs --help for model, sampling, token, schema, tool, upload-retention, and file options.

Packaging Rules

node_modules is never committed or copied as source.
scripts/package-lock.json is the reviewed dependency pin.
scripts/bootstrap.sh recreates dependencies with npm ci --ignore-scripts so reviewed packages cannot execute lifecycle scripts during setup.
Uploaded Gemini Files API objects are deleted after each run unless --keep-files is explicitly passed.
node scripts/test_gemini_mm.mjs locks the reviewed default and quota hint and verifies that SIGINT and SIGTERM wait for uploaded-file cleanup before the wrapper exits.
Consumer copies must be refreshed through the pinned skills manager; do not edit installed copies by hand.

Read the full file on GitHub · 74 lines

Files

What ships with it

7 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 74 lines · 38 tokens per session scan A 4d966d3fe0c1

Subscribe to this mod's changes

gemini-files-api is a skill published in the GitHub repository fiveonecode/agent-skills (19 stars, last pushed 10d ago), licensed MIT. It adds 38 tokens to every session and 560 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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